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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b75866ad97948670c3ca32f8cff07ad9865a6c1ba13773bd7c715d7e26cd10' 
  AND token = 'Nipl/Q9TxHkb7geATB+H6giFbPtVkVVp0LGj8djxgOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}